Method for preparing lignin sulfonate dye dispersant

A lignosulfonate and dye dispersant technology, applied in the direction of organic dyes, can solve the problems of dispersion performance change, long production cycle, poor heat resistance stability, etc., achieve good heat resistance stability and high temperature dispersion performance, enhance Adsorption capacity, effect of increasing molecular weight

Active Publication Date: 2011-09-07
延边石岘双鹿实业有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method requires three stages of filtration, the process is complicated and the production cycle is long, the lignosulfonate impurity content obtained by this method is less
[0005] Lignosulfonate with less impurity content can be used as a dye dispersant, but its heat resistance stability is poor. Using this kind of lignosulfonate as a dye dispersant, the sanded dye component is dispersed during the drying process. Properties will change, affecting its high temperature dispersion properties

Method used

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  • Method for preparing lignin sulfonate dye dispersant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Using pine as raw material, white pine, red pine, etc. as ingredients, using calcium bisulfite as cooking liquid to pulp the waste liquid, in which the content of calcium lignosulfonate is 60%, and the content of reducing sugar is 20% , other impurity content is 10%; Adopt five-effect evaporator to concentrate described waste liquid, obtain the concentrated liquid that solid content is 35%, specific gravity is about 1.10; Add 150 kilograms of sodium hydroxide in 2857kg waste liquid, obtain The pH value of the solution is about 6.3, the temperature of the obtained solution is raised to 90° C., the air is passed through to carry out the hypoglycemic reaction, and the reaction is carried out for 2 hours to obtain the first solution, wherein the reducing sugar content is reduced to 1%;

[0081] Add 240kg of light sodium carbonate to the first solution, carry out a displacement reaction at a temperature of 80°C to 90°C, and react for 40min to 60min; filter the solution with a...

Embodiment 2

[0083] Add 1 mol of β-methylnaphthalene to 1 mol of concentrated sulfuric acid, heat up to 160°C for sulfonation for 120 minutes, dissolve the obtained sulfonated product in water, cool down to 120°C, add 1 mol of formaldehyde, and condense for 120 minutes to obtain methylnaphthalenesulfonic acid formaldehyde condensation thing;

[0084] Add 1040g of the sodium lignosulfonate solution prepared in Example 1 to a 2000mL reaction flask, heat up to 75°C while stirring, add 0.624mol of formaldehyde to react for 120min, and then add 200g of the above-prepared methylsulfonate naphthaldehyde condensate, Raise the temperature to 100°C and react for 240 minutes, then add activated carbon to it for adsorption for 20 minutes, centrifuge the solution, filter, and spray dry to obtain a lignosulfonate dye dispersant, the pH value of the lignosulfonate dye dispersant is is 9.5.

[0085] According to the method described above, the performance test of the lignosulfonate dye dispersant, the re...

Embodiment 3

[0087] Add 1040g of the sodium lignosulfonate solution prepared in Example 1 into a 2L small autoclave, heat up to 75°C under stirring, then add 50g of 2-naphthol, 50g of benzyl alcohol and 0.832mol of formaldehyde, continue to heat up to 140°C for 1 hour , and then add activated carbon to it for adsorption for 20min, centrifuge the solution, filter and spray dry to obtain a lignosulfonate dye dispersant, and the pH value of the lignosulfonate dye dispersant is 9.3.

[0088] According to the method described above, the performance test of the lignosulfonate dye dispersant, the results show that the dispersant performance of the lignosulfonate dye dispersant can reach grade 5. It has good heat resistance and stability, and it has good high-temperature dispersion performance at 130 ° C. It basically does not stain fibers, and its reducibility to azo dyes is also weak.

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Abstract

The invention provides a method for preparing lignin sulfonate dye dispersant. The method comprises the following step of carrying out condensation reaction on sodium lignin sulfonate, formaldehyde and a compound containing hydroxyls to generate the lignin sulfonate dye dispersant, wherein the compound containing hydroxyls is one or more of the sulfonic acid methyl naphthalene, naphthalene sulfonic acid, phenol, naphthol, benzyl alcohol and lignin, both the sodium lignin sulfonate and the compound containing hydroxyls can be subjected to the condensation reaction together with the formaldehyde to generate the lignin sulfonate with high molecular weight. The capacity of absorbing the dye molecular of the lignin sulfonate can be enhanced and the activity of the lignin sulfonate can be improved so that the lignin sulfonate has good heat-resistant stability and high-temperature dispersibility. Experiments show that the dye composite, which is obtained by singly using the lignin sulfonate dye dispersant prepared by adopting the method provided by the invention for the C. I disperse blue 79, has 5-grade stability and 5-grade high-temperature dispersibility at 150 DEG C.

Description

technical field [0001] The invention belongs to the technical field of dye dispersants, in particular to a preparation method of lignosulfonate dye dispersants. Background technique [0002] Lignosulfonate, also known as sulfonated lignin, is a by-product of sulfite papermaking wood pulp. It is a linear polymer compound and has a wide range of uses, such as a binder for animal feed and a thinner for oil well mud , soil stabilizer, dye dispersant, pesticide processing aid, pesticide slow-release agent, concrete water reducer, concrete superplasticizer, ceramic reinforcement, refractory reinforcement, gypsum board reinforcement, protein precipitant, fertilizer granulation Binders, carbon black granulation binders, asphalt emulsifiers, oil recovery additives, phenolic resin substitutes, rubber reinforcing agents, battery plate additives, etc. [0003] A large amount of waste liquid will be produced in the sulfite pulping process, and the main component of the waste liquid is l...

Claims

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Application Information

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IPC IPC(8): C09B67/38C09B67/28
Inventor 郑艳民朱德仁徐龙杰
Owner 延边石岘双鹿实业有限责任公司
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